EXAMPLE 10 Relative frequency method

image The Gardasil vaccine

The Case Study data set Gardasil provides the following relative frequency distribution for the variable Completed, indicating whether or not the patient completed the course of three Gardasil vaccinations. Use the relative frequency method to find the probability that a randomly chosen patient completed the treatment.

Completed Frequency Relative frequency
Yes 469 0.3319
No 944 0.6681
Total 1413 1.0000

Solution

Define the event.

C: Patient completed treatment.

We use the relative frequency method to find the probability of event C:

NOW YOU CAN DO

Exercises 51–60.